Can't a Finney attack be combined with a very long-running transactions to DoS all nodes? If a miner earns all block fees then even without a Finney attack a malicious miner could include a lot of long-running transactions into their block to slow down processing of the next block / transactions.
Actually, we never were planning to have a miner collect more than 50% of transaction fees. Now, we're debating between 0% (tx fees burned), 50% and something in between.
And what about the Finney-like attack?
1. Alice finds a block but doesn't send it to peers
2. Bob finds a block and sends it to peers
3. Alice sees this coz she connected to a big part of the network
4. Alice sends her block to peers
5. Some nodes accept Alice's block, some accept Bob's one
6. The next block triggers chain reorg that invalidates Alice's block with some probability (if she knows who r the biggest miners then she shouldn't send her block to them to make this probability very high)
The catch is that Alice's block contains very long-running transactions and nodes that accepted it wasted their computational resources. The situation becomes worse if such the nodes r computing her block when the next one arrives.